AbstractThe tribe Thoronini Kozlov, 1970 as interpreted here in its broader sense includes also the tribes Pseudanteridini and Tiphodytini as proposed by Kozlov (1970), i.e. the following genera:ThoronHaliday, 1833,Neothoronn. gen.,PseudanterisFouts, 1927,Thoronellan. gen.,Microthoronn. gen.,Tanaodytesn. gen., andTiphodytesBradley, 1902. The new taxa described are:Neothoron lautusn. gen. and n. sp., Ecuador;Thoronella elegansn. gen. and n. sp., Brazil;Microthoron baeoidesn. gen. and n. sp., Malaya;Tanaodytes longipesn. gen. and n. sp., Malaya;Tanaodytes sororn. sp., Ceylon;Tiphodytes godavarin. sp., Nepal;Tiphodytes mymarn. sp., Malaya;Tiphodytes selangorn. sp., Malaya.The generaThoron,Pseudanteris, andTiphodytesare recorded for the first time in Canada. The nameCalliscelioAshmead, 1893 is considered a synonym ofCaloteleaWestwood, 1837 (new synonymy).The species of Thoronini, the biology of which is known, parasitize eggs of water Heteroptera (Gerridae, Nepidae) and it is assumed that most if not all species of this tribe either live in, or are closely associated with, aquatic or semi-aquatic habitats. This is inferred, in the case of species for which definite information is lacking, from the sites in which the adults have been collected, all of which were near water.